System of electrical distribution.



Patented Sept. 26, I899.

B. G. LAMME. SYSTEM OF ELECTRICAL DISTRIBUTION.

- (Application filed Jan. 30, 1899,) (No Model.)

WITNESS A TTOHNEY.

' UNITED STATES PATENT BENJAMIN-d LAMMIE', on PIT'LSBURG, PENNSYLVANIA.Assisnon XVESTINGHOUSE ELEURIC AND MANUFACTURING- (OMPANL 01? FEET???SYLVANIA.

SYSTEM OF E LECT RiC AL; DISTRlBUTiG,

SPECIFICATION forming part of Letters Patent N 0. 633,855, datedSeptember 2d, 182% Application filed January 30, 1899.' Serial No.103,791. No model.)

/'0 a]! whom/1'! Iii/(Ly concern: g r Be it known that I, BENJAMIN G.LAMME, a

citizen of the United States, residingin Pitts.

burn, in the county of Allegheny and State '5 of Pennsylvania,l1aveinvented a. new and user fuilmproveme'ntin Systems ofElectriealDistribution, (Case No. 804,)of which the followi ng is aspecification.

My invention relates to the distribution of to electricalenergy, and hasparticular referonce to means for varying the alternatingcurrentelectro'moti ve force supplied to translating devices. The object of myinvention is to provide a :5 simple and cflicieut means forvarying theelectromotive forces supplied to translating devices fronrthesecondaries of stationary transformers without varying the active lengthof eitherof'the main windings of such :0 transformers or the normalinductive rclatihn' of such windings.

In the transformation from a very high to a ver 1 low voltage by meansof stationary transformers the volume of secondary ourrent is so greatas to render 'the switching from one lead tonnother for the purpose ofvarying the active length ofthe secondary impracticable, and the primaryelcctromotive forceis so high that the length of the primary 3o windingcannot be varied either economically or safely. It is, of course,equally'diiiicult to vary secondary electro'inotive forces by var ingthe active length of eitherof the windings of step-n p transformers orthose having a one-" to-oneratio of transformation; bntthenecessityforelectroniotive-forcc regulation in such cases does not often'arisc.

.My invention is intended for usein connection with any and all types ofstationary transo formers wherever it is desired to vary the secondaryelectroinoti-ve force.

In the accompanying drawing I have shown a diag'ramof a system ofdistribution com prising an alternating-current generator 1, a stepdownstationary transformer 2, the primer 3 of which is in circuit with saidgenerator], and translating devices 4, supplied with current from themain secondary winding 5 of the transformer 2.

In order to vary the eleetroinoti ve force sum plied to the translatingdevices, as in ofteninterfere with the operation of the switchingdevices 8 9. In order that the variation of the electromotive force ofthis'auxiiiary secondaryeoil may be imparted to the circuit supplyingthe translating devices, I provide I a series transformer 10,.on'cwinding 11 of which is in circnitwith the main secondary 5 of thetransformer 2, and the other winding in series with theauxiliarysecondary"irindingfi or with such portion of the same as may be incircuit through the switching devices 8 9. \Vhen the'windings of theseries trans former .10 are arranged and connected in cir cuit asindicatcdinthe drawing, any increase in the active length of thesecondary winding (3 beyond a zero value will correspondingly reduce theelectroinotive force in the main secondary circuit. It is to he an(lerstood that a reversalof the, terminals of either winding of thetransforinier 10 ivili serve to make the action of the secondary 6 1ihat of a booster with reference to the clectroniotive force. of the mainsecondary circuit and that my invention is intended to cover both arrangements and inet-hods' of operation.

will be readily seen that with this arran e inent of apparatus theauxiliary secondary winding ma be designed and proportioned to have arange equal to the maxim n m variation in the secondary electromotiveforce desired, and as this is ordinarily only comparatively smallpercentage of the en tire secondary else tromotivc force the rcgniationmay he rcadiiy 'eifected without injury to the switchingdoviccsemployed.

I have for convenience shown the invention as applied to a single-phasecircuit; lost will be understood that it is equally appiiea bio tocircuits of two or more phases, and it will also be understood that thetranslating devices supplied with current from thc traus former luiayhe'oi any known type or kindand connected in circuit in any well-kuowumanner, I

I claim as my invention?- '1. In a system of electrical distribution,the combination with an alternating-current generator, of translatingdevices, a transformer having a primary winding in circuit with saidgenerator, a main secondary winding in circuit with said translatingdevices, an auxiliary secondary winding closed upon itself through acoil which is in inductive relation to a portion of the circuitsupplying the translating devices'and means'for varying the 210 tivelength of saidauxiliary secondary wind- 2. in a system of electricaldistribution, the combination with a source of alternating currents, oftranslating devices, a transformer having a n imary winding in circuitwith the ond transformer havmg one of its windings in said closedcircuit and its other winding in circuit with the non-variable secondaryof the main transformer.

3. In a system of electrical distribution, a main transformer having anauxiliary secondary winding,- asupplemental transformer hawing itswindings respectively in series with the main and auxiliary windings ofthe main transformer and means for varying the active length of saidauxiliary winding, all combined substantially as shown and described.

.-In testimony whereof I have hereunto subscrigied my name'this 27th dayof January, 189 I 'BENJ. G.- LAMME. Witne ses! WEsLnY G. CARR, II; C.TENER.

